Civil Engineering Reference
In-Depth Information
(a)
(b)
(c)
(d)
6
6
6
6
5
5
5
5
4
4
4
4
3
3
3
3
2
2
2
2
1
1
1
1
T
1
=1.0 s
T
2
=0.31 s
T
3
=0.17 s
T
4
=0.11 s
(e)
(f)
6
6
5
5
4
4
3
3
2
2
1
1
T
5
=0.06 s
Figure 8.14
First, six model shapes: (a) 1
st
model; (b) 2
nd
model; (c) 3
rd
model; (d) 4
th
model;
(e) 5
th
model; (f ) 6
th
model.
T
5
=0.08 s
The mass matrix
M
dd
can be written as
2
3
000000
0900000
00 0000
000 000
0000 00
00000 0
4
5
M
dd
=
Mg
ð8
:
105Þ
